package com.sky.service.impl;


import com.sky.dto.GoodsSalesDTO;
import com.sky.entity.OrderDetail;
import com.sky.entity.Orders;
import com.sky.mapper.OrderDetailMapper;
import com.sky.mapper.OrderMapper;
import com.sky.mapper.UserMapper;
import com.sky.service.ReportService;
import com.sky.service.WorkspaceService;
import com.sky.vo.*;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang.StringUtils;
import org.apache.poi.util.StringUtil;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.InputStream;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

@Service
@Slf4j
public class ReportServiceImpl implements ReportService {

    @Autowired
    private OrderDetailMapper orderDetailMapper;
    @Autowired
    private OrderMapper orderMapper;

    @Autowired
    private UserMapper userMapper;

    @Autowired
    private WorkspaceService workspaceService;

    /**
     * 统计指定时间区间的营业额数据
     *
     * @param begin
     * @param end
     * @return
     */
    public TurnoverReportVO getTurnoverStatistics(LocalDate begin, LocalDate end) {
        //从begin到end这个时间段的天数集合
        List<LocalDate> dateList = new ArrayList<>();
        dateList.add(begin);
        //计算日期区间
        while (!begin.equals(end)) {
            begin = begin.plusDays(1);
            dateList.add(begin);
        }

        List<Double> turnoverList = new ArrayList<>();

        //计算营业额
        for (LocalDate date : dateList) {
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);
            // select sum(amount) from orders where status =#{status},time = beginTime~endTime
            Map map = new HashMap<>();
            map.put("begin", beginTime);
            map.put("end", endTime);
            map.put("status", Orders.COMPLETED);
            Double turnover = orderMapper.sumByMap(map);
            turnover = turnover == null ? 0.0 : turnover;
            turnoverList.add(turnover);
        }
        //将集合里面的元素一个个取出来用,隔开
        String dataListJoin = StringUtils.join(dateList, ",");
        String turnoverListJoin = StringUtils.join(turnoverList, ",");
        return TurnoverReportVO
                .builder()
                .dateList(dataListJoin)
                .turnoverList(turnoverListJoin)
                .build();


    }

    /**
     * 用户统计
     *
     * @param begin
     * @param end
     * @return
     */
    public UserReportVO getUserStatistics(LocalDate begin, LocalDate end) {
        //从begin到end这个时间段的天数集合
        List<LocalDate> dateList = new ArrayList<>();
        dateList.add(begin);
        //计算日期区间
        while (!begin.equals(end)) {
            begin = begin.plusDays(1);
            dateList.add(begin);
        }

        //当天新增的用户数量
        List<Integer> newUserList = new ArrayList<>();
        //每天的用户数量
        List<Integer> totalUserList = new ArrayList<>();


        for (LocalDate date : dateList) {
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);
            Map map = new HashMap<>();
            map.put("end", endTime);
            //总用户数量
            Integer totalUser = userMapper.countByMap(map);
            map.put("begin", beginTime);
            //新用户数量
            Integer newUser = userMapper.countByMap(map);
            newUserList.add(newUser);
            totalUserList.add(totalUser);
        }
        return UserReportVO.builder()
                .newUserList(StringUtils.join(newUserList, ","))
                .dateList(StringUtils.join(dateList, ","))
                .totalUserList(StringUtils.join(totalUserList, ","))
                .build();
    }

    public OrderReportVO getOrdersStatistics(LocalDate begin, LocalDate end) {
        //从begin到end这个时间段的天数集合
        List<LocalDate> dateList = new ArrayList<>();
        dateList.add(begin);
        //计算日期区间
        while (!begin.equals(end)) {
            begin = begin.plusDays(1);
            dateList.add(begin);
        }
        //查询每天的订单数
        List<Integer> orderCountList = new ArrayList<>();
        //查询每天的有效订单总数
        List<Integer> validOrderCountList = new ArrayList<>();

        for (LocalDate date : dateList) {
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);
            //查询每天的订单数
            Integer orderCount = getOrderCount(beginTime, endTime, null);
            //查询每天的有效订单数
            Integer validOrderCount = getOrderCount(beginTime, endTime, Orders.COMPLETED);

            orderCountList.add(orderCount);
            validOrderCountList.add(validOrderCount);
        }
        //时间区间内的订单总数
        Integer totalOrderCount = orderCountList.stream().reduce(Integer::sum).get();
        //时间区间内的有效订单总数
        Integer validOrderCount = validOrderCountList.stream().reduce(Integer::sum).get();
        //计算订单完成率
        double orderCompletionRate = 0.0;
        if (totalOrderCount != 0) {
            orderCompletionRate = validOrderCount.doubleValue() / totalOrderCount;
        }
        return OrderReportVO.builder()
                .dateList(StringUtils.join(dateList, ","))
                .orderCountList(StringUtils.join(orderCountList, ","))
                .validOrderCountList(StringUtils.join(validOrderCountList, ","))
                .totalOrderCount(totalOrderCount)
                .validOrderCount(validOrderCount)
                .orderCompletionRate(orderCompletionRate)
                .build();
    }

    /**
     * 销量前十商品统计
     * @param begin
     * @param end
     * @return
     */
    public SalesTop10ReportVO getSalesTop10(LocalDate begin, LocalDate end) {
        LocalDateTime beginTime = LocalDateTime.of(begin, LocalTime.MIN);
        LocalDateTime endTime = LocalDateTime.of(end, LocalTime.MAX);
        List<GoodsSalesDTO> goodsSalesDTOList = orderMapper.getSalesTop10(beginTime, endTime);

        List<String> names = goodsSalesDTOList.stream().map(GoodsSalesDTO::getName).collect(Collectors.toList());
        String nameList = StringUtils.join(names, ",");

        List<Integer> numbers= goodsSalesDTOList.stream().map(GoodsSalesDTO::getNumber).collect(Collectors.toList());
        String numberList = StringUtils.join(numbers, ",");

        return SalesTop10ReportVO.builder()
                .nameList(nameList)
                .numberList(numberList)
                .build();
    }

    private Integer getOrderCount(LocalDateTime begin, LocalDateTime end, Integer status) {
        Map map = new HashMap<>();
        map.put("begin", begin);
        map.put("end", end);
        map.put("status", status);
        return orderMapper.countByMap(map);
    }


    /**
     * 导出运营数据报表
     */
    public void exportBusinessData(HttpServletResponse response) {

        //1.查询数据库，获取营业数据--查询最近30天的运营数据
        LocalDate dataBegin = LocalDate.now().minusDays(30);
        LocalDate dataEnd = LocalDate.now().minusDays(1);
        //查询数据
        BusinessDataVO businessData = workspaceService.getBusinessData(LocalDateTime.of(dataBegin, LocalTime.MIN), LocalDateTime.of(dataEnd, LocalTime.MAX));

        //2.通过poi写入excel文件
        //通过反射
        InputStream inputStream = this.getClass().getClassLoader().getResourceAsStream("template/运营数据报表模板.xlsx");        try {
            //基于模版文件创建一个新的excel
            XSSFWorkbook excel = new XSSFWorkbook(inputStream);
            //写入sheet1
            XSSFSheet sheet = excel.getSheet("sheet1");
            //填充数据-时间
            sheet.getRow(1).getCell(1).setCellValue("时间："+dataBegin + "至"+dataEnd);
            //获得第4行
            XSSFRow row = sheet.getRow(3);
            //获取单元格
            row.getCell(2).setCellValue(businessData.getTurnover());
            row.getCell(4).setCellValue(businessData.getOrderCompletionRate());
            row.getCell(6).setCellValue(businessData.getNewUsers());
            row = sheet.getRow(4);
            row.getCell(2).setCellValue(businessData.getValidOrderCount());
            row.getCell(4).setCellValue(businessData.getUnitPrice());

            for (int i = 0; i < 30; i++) {
                LocalDate date = dataBegin.plusDays(i);
                //准备明细数据,查询某一天的数据
                businessData = workspaceService.getBusinessData(LocalDateTime.of(date,LocalTime.MIN), LocalDateTime.of(date, LocalTime.MAX));
                //获得某一行
                row = sheet.getRow(7 + i);
                row.getCell(1).setCellValue(date.toString());
                row.getCell(2).setCellValue(businessData.getTurnover());
                row.getCell(3).setCellValue(businessData.getValidOrderCount());
                row.getCell(4).setCellValue(businessData.getOrderCompletionRate());
                row.getCell(5).setCellValue(businessData.getUnitPrice());
                row.getCell(6).setCellValue(businessData.getNewUsers());
            }

            //3.通过输出流将excel文件下载到客户端浏览器
            //通过输出流将文件下载到客户端浏览器中
            ServletOutputStream out = response.getOutputStream();
            excel.write(out);
            //关闭资源
            out.flush();
            out.close();
            excel.close();

        } catch (IOException e) {
            throw new RuntimeException(e);
        }


    }
}
